What is CVE-2023-20851?

CVE-2023-20851 is a medium-severity vulnerability in Google Android, classified under Out-of-bounds Read. CVSS score: 6.3/10. Published 2023-09-04.

How severe is CVE-2023-20851?

Medium severity. CVSS v3 base score is 6.3 out of 10.

Out-of-bounds Read in Google Android

CVE-2023-20851

In stc, there is a possible out of bounds read due to a race condition. This could lead to local escalation of privilege with System execution privileges needed. User interaction is needed for exploitation. Patch ID: ALPS08048635; Issue ID: ALPS08048635.

Vulnerability class: Buffer Overflow

Published 2023-09-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.001 (0.4th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 0th percentile — 0.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000

Affected products

Google Android — versions 11.0, 13.0
Mediatek Mt8188
Mediatek, Inc. Mt8188 — versions Android 11.0, 13.0

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

corp.mediatek.com/product-security-bulletin/September-2023 (Vendor Advisory)

Frequently asked questions

What is CVE-2023-20851?: CVE-2023-20851 is a medium-severity vulnerability in Google Android, classified under Out-of-bounds Read. CVSS score: 6.3/10. Published 2023-09-04.
How severe is CVE-2023-20851?: Medium severity. CVSS v3 base score is 6.3 out of 10.